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JP2018101894

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DESCRIPTION JP2018101894
Abstract: To provide an on-vehicle acoustic device capable of improving the weather resistance to
the environment outside a vehicle and suppressing a decrease in controllability of acoustic
characteristics and appropriately discharging heat generated from a voice coil. . A frame 6 has an
annular portion 6a and a supporting portion 6c extended from the annular portion 6a, and a
frame 6 attachable to a through hole 1a formed in a supporting member 1 for separating an
indoor space S1 and an outdoor space S2. A vibrating plate 10 vibratably supported inside the
annular portion 6a, a magnetic circuit 7 supported by the supporting portion 6c and having a
magnetic gap, and a cylindrical shape, and one end of the vibrating plate 10 from one vibrating
surface Between the voice coil 8 which is wound around the side of the bobbin 9 and is disposed
in the magnetic gap together with a part of the bobbin 9 and the diaphragm 10 so that the The
air passage from the air chamber S to the vehicle interior space S1 has an inner space of the
bobbin 9 and has a rear cover body 3 forming the chamber S and supported in a freely vibrating
manner and discharging the back pressure to the vehicle exterior space S2. It is formed with a
passing path Placing acoustic device (speaker) 2. [Selected figure] Figure 1
Automotive audio equipment
[0001]
The present invention relates to an on-vehicle acoustic device that radiates the sound of a
speaker mounted on a support member that separates a vehicle interior space from a vehicle
exterior space into the vehicle interior and discharges the back pressure outside the vehicle
exterior.
[0002]
10-05-2019
1
In a vehicle-mounted acoustic device in which a speaker is directly mounted on a support
member (partition wall) that separates a vehicle outdoor space such as a door or an engine room
from a vehicle indoor space, water droplets and dust enter through the gap of the window glass
in the door There is a fear, and even in the engine room, the environment of the exterior space of
the vehicle is very severe as compared to the interior of the vehicle because it is easily affected
by radiant heat and oil of the engine.
[0003]
As a conventional example of this type of vehicle-mounted acoustic device, as described in Patent
Document 1, an opening is provided in the door trim and the inner panel, and the sound of a
speaker attached to the inner panel is radiated into the vehicle compartment from the opening. In
addition, it has been proposed that the rear face of the speaker is covered with a rear cover body
made of a stretchable material.
The rear cover body closes the cylindrical main body rear open surface surrounding the speaker,
and a closed space is defined between the rear surface of the speaker and the rear cover body.
[0004]
In the vehicle-mounted acoustic device configured as described above, the rear cover body covers
the rear surface of the speaker facing the inside of the door regarded as the space outside the
vehicle, so that rainwater or dust that has entered the door gets into the speaker Can be
prevented.
In addition, the rear cover body is formed of a material that is rich in elasticity and flexibility, and
the rear cover body is deformed in accordance with the vibration of the diaphragm that is a
component of the speaker, so that the vibration is gently damped by the vibration of the
diaphragm. It can be added to improve the bass characteristic.
[0005]
Japanese Utility Model Publication No. 62-39391
10-05-2019
2
[0006]
However, in the conventional on-vehicle acoustic device disclosed in Patent Document 1, there is
a possibility that the following problems may occur due to the closed space being defined
between the rear face of the speaker and the rear cover body. The
[0007]
First of all, the change of the environmental temperature changes the volume of the closed space.
Due to this volume change, the position of the diaphragm that defines the closed space changes,
and as the position of the diaphragm changes, the position of the bobbin attached thereto also
changes.
As a result, the neutral position in the magnetic circuit of the voice coil wound on the bobbin
changes with the environmental temperature. It is needless to say that the instability of the
neutral position of the voice coil is not preferable for the stabilization of the acoustic
characteristics of the speaker. Thus, the above-mentioned enclosed space may lead to a reduction
in the control of the acoustic characteristics of the loudspeaker.
[0008]
In addition, when the diaphragm is moved by causing the bobbin to reciprocate by supplying
current to the voice coil, sound pressure is generated in the closed space by the vibration of the
diaphragm, and this sound pressure is transmitted to the closed space and is transmitted to the
diaphragm It also vibrates the rear cover body disposed opposite to it. Although the vibration of
the rear cover body may be advantageous to the acoustic characteristics as described above,
when the space between the diaphragm and the rear cover body is a closed space, the relative
position change between the diaphragm and the rear cover body The volume of the enclosed
space fluctuates, which causes the pressure across the enclosed space to fluctuate. This pressure
fluctuation can be a factor that inhibits the vibration of the diaphragm. This tendency is
remarkable when the vibration of the diaphragm and the vibration of the rear cover body are in
opposite phase, and it is feared that the acoustic characteristics are adversely affected.
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3
[0009]
Furthermore, when current flows through the voice coil to vibrate the diaphragm, the voice coil
generates heat. If the heat generated from the voice coil can not be properly dissipated at the
time of large amplitude etc., there is a high possibility that a fatal failure such as melting of the
voice coil may occur. In the case of the acoustic device having the structure described in Patent
Document 1, since the voice coil is disposed in the closed space, the heat generated from the
voice coil is easily accumulated in the closed space, and the exhaust from the voice coil is
eliminated. It is difficult to get the heat properly.
[0010]
The present invention has been made in view of the circumstances of the prior art as described
above, and its object is to improve the weather resistance to the environment outside the vehicle
and to suppress the decrease in the controllability of the acoustic characteristics. It is an object of
the present invention to provide an on-vehicle acoustic device capable of appropriately
discharging the heat generated from
[0011]
The present invention, which is provided to solve the above-mentioned problems, according to
one aspect, has an annular portion and a support portion extending from the annular portion,
and a penetrating portion formed in a partition plate separating an interior space from an
interior space A frame attachable to a hole, a diaphragm supported vibratably inside the annular
portion, a magnetic circuit supported by the support portion and having a magnetic gap, and a
cylindrical shape, one of the diaphragms A bobbin provided on the diaphragm so that one end
portion thereof protrudes from the vibration surface of the speaker; a voice coil wound around a
side surface of the bobbin and disposed in the magnetic gap together with a part of the bobbin;
An air chamber formed between the air chamber and a rear cover body which is vibratably
supported and discharges a back pressure to an outside space of the vehicle, and an air passage
extending from the air chamber to the inside space of the vehicle is an inner space of the bobbin
Have a path through It is vehicle audio device according to claim (speaker) which is formed.
[0012]
By having the rear cover body, the weather resistance to the environment outside the vehicle can
be improved.
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4
In addition, when the air chamber formed between the rear cover body and the diaphragm has an
air passage leading to the external space, the volume of the air chamber fluctuates due to the
vibration of the diaphragm and the vibration of the rear cover body generated based on this.
However, since the air can be taken in and out of the air outside the room, the pressure
fluctuation in the air room can be made less likely to occur.
Therefore, the decrease in the controllability of the acoustic characteristics is suppressed. In
addition, since the air passage from the air chamber to the external space has a path passing
through the inner space of the bobbin, the discharge of air from the air chamber or the air
chamber caused when the volume of the air chamber changes as described above An air flow
generated by the suction of air to the air can pass through the inner space of the bobbin. The
heat generated from the voice coil can be properly discharged by this air flow.
[0013]
In the above-mentioned in-vehicle acoustic device, the bobbin and the magnetic circuit, in which
the voice coil is wound, may be disposed in a vehicle interior space opposite to the air chamber
with the diaphragm interposed therebetween. In the case of such a configuration, the voice coil
serving as the heat source is located outside the air. Therefore, it is possible for the voice coil to
be cooled more stably by the air flow flowing in the air passage due to the volume fluctuation of
the air chamber. In addition, when the voice coil is in the air chamber, heat is accumulated in the
air chamber and the temperature rises, but such a situation can be prevented.
[0014]
In the above-mentioned in-vehicle acoustic device, it is preferable that the rear cover body and
the diaphragm be formed of a non-air-permeable material. When such a configuration is
provided, the movement of the air caused by the volume fluctuation of the air chamber is more
likely to occur by the path passing through the inner space of the bobbin, so that the voice coil
can be cooled more stably. It becomes.
[0015]
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5
In the above-mentioned in-vehicle acoustic device, the diaphragm may be provided with a
through hole which forms a part of the air passage, and in this case, the diaphragm is opposite to
the side where the bobbin extends The reinforcement member located around the said through
hole may be provided in the opposing surface side which is a surface of a side, and the
ventilation hole which forms a part of said ventilation path may be provided in the said
reinforcement member. In the case of such a configuration, the movement of the air caused by
the volume fluctuation of the air chamber may be easily caused by the path passing through the
inner space of the bobbin. At this time, the voice coil can be cooled more stably.
[0016]
In the above-mentioned in-vehicle acoustic device, it is preferable that the air passage has a path
passing through the outer space of the bobbin and passing out of the magnetic circuit after
passing through the inner space of the bobbin from the air chamber. With this configuration, the
bobbin and the voice coil wound around it can be cooled more stably.
[0017]
According to the vehicle-mounted acoustic device of the present invention, it is possible to
improve the weather resistance to the environment outside the vehicle, to suppress the decrease
in the controllability of the acoustic characteristics, and to appropriately discharge the heat
generated from the voice coil. .
[0018]
It is a sectional view of an in-vehicle acoustic device concerning one embodiment of the present
invention.
It is the figure which added the path | route which makes one of the ventilation paths in FIG. 1 by
the arrow. It is a figure which shows the relationship of the volume fluctuation | variation of the
air chamber in the vehicle-mounted acoustic device which concerns on one Embodiment of this
invention, and the flow of the air which flows through an air flow path. It is a figure which shows
notionally the environmental temperature dependence of the neutral position of the voice coil of
a speaker in, when the air chamber in a vehicle-mounted acoustic device is enclosed space. When
the air chamber in a vehicle-mounted acoustic device is a closed space, it is a figure which shows
notionally the state which the vibration of a diaphragm and the vibration of a rear cover body are
10-05-2019
6
vibrating in a reverse phase.
[0019]
An embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, in a vehicle-mounted acoustic device according to an embodiment of the
present invention, a vehicle interior space S1 and a vehicle exterior space (for example, an engine
room The speaker (vehicle-mounted acoustic device) 2 is supported by the support member 1
separated from the S 2), and the rear cover body 3 is supported by the support member 1 so as
to cover the back surface of the speaker 2. The support member 1 is provided with an opening
1a for communicating the interior space S1 with the exterior space S2, and the rear cover body 3
is fixed to the support member 1 via the gasket 4 so as to close the opening 1a. . The speaker 2 is
disposed in front of the rear cover 3 via a spacer 5, and an air chamber S is defined between a
diaphragm 10 and the rear cover 3, which will be described later, of the speaker 2.
[0020]
The speaker 2 is disposed in the magnetic gap of the frame 6 having a substantially truncated
cone shape, the magnetic circuit 7 supported by the support portion 6 c of the frame 6, and the
magnetic circuit 7 and driven by electromagnetic interaction when energized. A voice coil 8, a
cylindrical bobbin 9 around which the voice coil 8 is wound, a substantially truncated coneshaped diaphragm 10 attached to the bobbin 9, and a round hook shape that blocks the inner
peripheral side of the diaphragm 10 It is mainly configured by the cap 11, the damper 12 that
elastically supports the bobbin 9 and the diaphragm 10, and the rear cover body 3 described
above. In other words, one end of the bobbin 9 protrudes from one of the vibrating surfaces of
the diaphragm 10 (in FIG. 1, it projects in the X1-X2 direction X1 side). ) Is provided on the
diaphragm 10.
[0021]
The diaphragm 10 has a through hole at the top of a truncated cone shape, and is fixed in a state
in which the bobbin 9 is inserted in the through hole, and the bobbin 9 is also referred to as the
X1-X2 direction (hereinafter, also referred to as "left-right direction"). Vibration causes vibration
in the diaphragm 10. As described later, from the viewpoint of efficiently cooling the voice coil 8
by utilizing the volume fluctuation of the air chamber S, the diaphragm 10 is preferably made of
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7
a non-air-permeable material.
[0022]
The frame 6 has an annular portion 6a on the outer peripheral side and a support portion 6c
having a frusto-conical shape extending from the annular portion 6a. The annular portion 6a is
fixed to the support member 1 together with the spacer 5 and the gasket 4 by means such as
screwing. The diaphragm 10 has an edge 10 a on the outer peripheral edge side, and this edge
10 a is attached to the annular portion 6 a of the frame 6. Further, a plurality of notch holes 6b
are formed on the peripheral surface of the support portion 6c having a truncated cone shape,
and the sound generated by the vibration of the diaphragm 10 passes through the notch holes
6b to the vehicle interior space S1. It is supposed to be emitted.
[0023]
The magnetic circuit 7 includes a center pole portion 7a located inside the voice coil 8, a bottom
plate 7b radially extending from the base end of the center pole portion 7a, and an annular
magnet 7c installed on the bottom plate 7b. And an annular top plate 7 d disposed on the
annular magnet 7 c and disposed on the outside of the voice coil 8. A magnetic gap G is formed
between the outer side surface of the center pole portion 7a and the inner side surface of the
annular top plate 7d.
[0024]
The rear cover body 3 is configured by an annular flexible member 3a made of a material having
high flexibility such as soft rubber and a non-flexible diaphragm 3b made of a metal material
such as a heat resistant resin or aluminum. The annular flexible member 3a and the non-flexible
diaphragm 3b are integrated by means of adhesion or the like. The annular flexible member 3 a
is an annular body having a semicircular cross-sectional shape, and the outer peripheral edge
thereof is sandwiched between the cylindrical gasket 4 and the spacer 5. The gasket 4 is a ringlike packing that seals between the interior space S1 and the exterior space S2, and the opening
1a and the gasket 4 are set to the same diameter size. The spacer 5 is a cylindrical member
interposed between the gasket 4 and the annular portion 6 a of the frame 6, and the edge 10 a of
the diaphragm 10 and the annular flexible member 3 a of the rear cover body 3 have a thickness
They are separated by an amount corresponding to the dimension in the X1-X2 direction of FIG.
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8
The non-flexible diaphragm 3 b is a flat plate-like member whose outer peripheral side is bent,
and the air chamber S is defined between the diaphragm 10 and the rear cover body 3 as
described above. The inflexible diaphragm 3b is not intended to be formed of a material having
no flexibility, but is sufficiently rigid and has a large influence on acoustic characteristics than
the annular flexible member 3a. As long as it is not given, it may be formed of a material having a
slight flexibility. As described later, from the viewpoint of efficiently cooling the voice coil 8 by
utilizing the volume fluctuation of the air chamber S, the rear cover body 3 is preferably made of
a non-air-permeable material.
[0025]
Further, since the rear cover body 3 for closing the opening portion 1a is a member exposed to
the vehicle outside space S2, the material, thickness and the like of the annular flexible member
3a and the inflexible diaphragm 3b make the environment of the vehicle outside space S2 It is
necessary to select in consideration, and for example, when the vehicle outdoor space S2 is an
engine room, it is sufficient to use one that can withstand the radiant heat of the engine, oil, and
the like.
[0026]
Here, the cap 11 has a through hole 11a at the top of a round bowl shape, and the air chamber S
defined between the diaphragm 10 and the rear cover body 3 of the speaker 2 by this through
hole 11a is an external space (In the present embodiment, it is in communication with the vehicle
interior space S1).
Due to the provision of the through hole 11a, an air passage extending from the air chamber S to
the external space (the vehicle interior space S1) is formed with a path passing through the inner
space S3 of the bobbin 9 (a space within the bobbin). ing.
[0027]
FIG. 2 shows the above path by gray arrows. Specifically, as shown by the arrows in FIG. 2, the
air chamber S reaches the internal space S3 through the through hole 11a, and the internal space
S3 is sandwiched between the voice coil 8 and the center pole portion 7a. Passing through the
gap SL1 and the gap SL2 sandwiched between the voice coil 8 and the annular top plate 7d, it
reaches the space S4 between the magnetic circuit 7 located outside the bobbin 9 and the
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9
damper 12, and from the space S4 to the damper A path 12 is formed to reach a space S5
between the diaphragm 10 and the damper 12 and to the interior space S1 through the notch
hole 6 of the frame 6. It is preferable that the damper 12 have appropriate air permeability from
the viewpoint of reliably creating the air passage of such a passage.
[0028]
By providing the air passage of such a path, an air flow is generated to move the air around the
voice coil 8 which is the heat source, every time a vibration that changes the volume of the air
chamber S occurs in the diaphragm 10. Proper cooling of the coil 8 is realized.
[0029]
FIG. 3 is a view showing the relationship between the volume fluctuation of the air chamber S
and the flow of air flowing through the air passage.
As shown in FIG. 3A, when the diaphragm 10 moves in the X1-X2 direction X2 side and the
volume of the air chamber S decreases, a part of the air in the air chamber S moves to the space
S3 in the bobbin The air is discharged from the internal space S3 through the space S4 and the
space S5 to reach the external space (the space S1 in the vehicle compartment), and the heat
generated in the voice coil 8 is discharged.
[0030]
On the other hand, as shown in FIG. 3B, when the diaphragm 10 moves in the X1-X2 direction
X1 side and the volume of the air chamber S increases, part of the air in the bobbin internal
space S3 is in the air chamber S. The negative pressure generated by the suction generates an air
flow from the space S4 to the space S3 in the bobbin. Since the air located around the voice coil 8
heated by the heat generated in the voice coil 8 moves by this air flow, cooling of the voice coil 8
is realized. The above-described air flow finally generates an air flow that flows from the external
space (the vehicle interior space S1) through the space S5 to the space S4.
[0031]
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10
When the air chamber S is a closed space, the above-described cooling process does not occur
because the air passage having the above-described path is not formed. Therefore, it may be
necessary to provide another means for properly discharging the heat generated from the voice
coil 8.
[0032]
In addition, when the air chamber S is a closed space, the volume of the closed space is changed
due to the change of the environmental temperature. FIG. 4 is a diagram conceptually showing
the environmental temperature dependency of the neutral position of the voice coil of the
speaker when the air chamber is a closed space.
[0033]
In an environment at a temperature lower than the reference state shown in FIG. 4A, as shown in
FIG. 4B, the volume of the air chamber S becomes smaller, and the diaphragm 10 moves in the
X1-X2 direction X2 side (Fig. 4 (b) dashed arrow). Along with the change of the position of the
diaphragm 10, the position of the bobbin 9 attached thereto also changes. As a result, as shown
by the dashed circle in FIG. 4B, the neutral position in the magnetic circuit 7 of the voice coil 8
wound on the bobbin 9 moves in the X1-X2 direction X2 side.
[0034]
On the other hand, in an environment having a temperature higher than the reference state
shown in FIG. 4A, as shown in FIG. 4C, the volume of the air chamber S increases, and the
diaphragm 10 is in the X1-X2 direction X1 side. Move to (Figure 4 (c) dashed arrow). Along with
the change of the position of the diaphragm 10, the position of the bobbin 9 attached thereto
also changes. As a result, as shown by the broken circle in FIG. 4C, the neutral position in the
magnetic circuit 7 of the voice coil 8 wound on the bobbin 9 moves in the X1-X2 direction X1
side.
[0035]
Needless to say, the instability of the neutral position of the voice coil 8 due to the influence of
the environmental temperature is not preferable for the stabilization of the acoustic
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11
characteristics of the speaker 2.
[0036]
In the vehicle-mounted acoustic device configured as described above, an audio signal is input
from the drive signal generator to be described later to the voice coil 8 of the speaker 2, and the
bobbin 9 and the diaphragm 10 are in the left-right direction (X1-X2 direction) in FIG. When it
vibrates, negative pressure and positive pressure are alternately generated in the air chamber S
on the back side of the diaphragm 10, and the rear cover body 3 is also displaced in the left-right
direction of FIG.
Here, the rear cover body 3 is configured such that the outside of the rigid high-flexible
diaphragm 3b is supported by the flexible ring-shaped flexible member 3a, and the rear cover
body along with the vibration of the diaphragm 10. When 3 receives a sound pressure, the
inflexible diaphragm 3b moves and only the annular flexible member 3a is deformed, so that
resonance based on expansion and contraction or deformation of the rear cover body 3 can be
eliminated. . That is, the back pressure can be discharged to the outdoor space S1. Therefore, the
frequency characteristics can be flattened over a wide frequency band.
[0037]
In addition, it is expected that the inertia resistance of the non-flexible diaphragm 3b will apply
gentle braking to the vibration of the diaphragm 10, and the bass characteristic will also be
improved. Although the acoustic characteristics can be controlled by causing the diaphragm 10
and the inflexible diaphragm 3b to interact with each other via the air in the air chamber S in this
manner, in the case where the air chamber S is a closed space, The change of the relative position
of the diaphragm 10 and the rear cover body 3 causes the volume of the closed space to change,
which causes the pressure of the entire closed space to change. This pressure fluctuation can be
a factor that inhibits the vibration of the diaphragm 10, in particular, a factor that increases the
amplitude of the diaphragm 10.
[0038]
This tendency is remarkable when the vibration of the diaphragm 10 and the vibration of the
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12
rear cover body 3 are in reverse phase. FIG. 5 is a view conceptually showing a state in which the
vibration of the diaphragm and the vibration of the rear cover body vibrate in opposite phases
when the air chamber is a closed space. FIG. 5A shows the case where both the absolute value of
the amplitude of the diaphragm 10 and the absolute value of the amplitude of the rear cover
body 3 are minimum. FIG. 5B shows the case where the amplitude of the diaphragm 10 is
maximized in the X1-X2 direction X2 and the amplitude of the rear cover 3 is maximized in the
X1-X2 direction X1. FIG. 5C shows the case where the amplitude of the diaphragm 10 is
maximum on the X1-X2 direction X1 side and the amplitude of the rear cover 3 is maximum on
the X1-X2 direction X2 side.
[0039]
In the case shown in FIG. 5 (b), the volume of the air chamber S which is the closed space is the
smallest, and hence the pressure in the air chamber S is in the highest state. In this state, the
vibration plate 10 moves in the direction to further increase the pressure in the air chamber S,
that is, the movement to displace in the X1-X2 direction X2 side (indicated by a solid arrow in
FIG. 5B). Is indicated by a white arrow in FIG. 5 (b), the pressure of the air in the air chamber S
acting on the X1-X2 direction X1 side. Suppressed by
[0040]
On the other hand, in the case shown in FIG. 5C, the volume of the air chamber S which is the
closed space is the largest, and hence the pressure in the air chamber S is in the lowest state. In
this state, the vibration plate 10 moves in the direction to further reduce the pressure in the air
chamber S, that is, the movement to displace in the X1-X2 direction X1 side (indicated by solid
arrows in FIG. 5C). Is indicated by a white arrow in FIG. 5 (c), the pressure of the air in the air
chamber S acting on the X1-X2 direction X2 side. Suppressed by
[0041]
On the other hand, in the speaker 2 according to the present embodiment, since the air chamber
S is not a closed space, air can be exchanged with the external space. Therefore, even if the
vibration of the diaphragm 10 and the vibration of the rear cover body 3 are in reverse phase, it
is difficult to generate a force that suppresses the displacement of the diaphragm 10 as described
above.
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13
[0042]
Although this embodiment and its application example were described above, the present
invention is not limited to these examples. For example, those skilled in the art may appropriately
add, delete, or change design elements of the above-described embodiments or their application
examples, or may appropriately combine the features of the embodiments. As long as it
comprises the gist, it is included within the scope of the present invention.
[0043]
For example, in the above-described speaker 2, the bobbin 9 and the magnetic circuit 7 on which
the voice coil 8 is wound are disposed in the vehicle interior space S1 on the opposite side of the
air chamber S with the diaphragm 10 interposed therebetween. I will not. The bobbin 9 and the
magnetic circuit 7 around which the voice coil 8 is wound may be disposed in the air chamber S.
Even in this case, the air flow path from the air chamber S to the outer space has a path passing
through the inner space and the outer space of the bobbin 9 and actively moves the air flow
around the bobbin 9 and the voice coil 8 From the viewpoint of cooling the voice coil 8
efficiently.
[0044]
Moreover, in the above-mentioned speaker 2, although the through-hole 11a was provided in the
top part of the cap 11, it is not limited to this. A through hole 11 a may be provided in addition to
the top of the cap 11, and the opening diameter of the through hole 11 a may be close to the
outer diameter of the cap, and the cap 11 may have a substantially ring shape. Even in this case,
the cap 11 can function as a reinforcing member that enhances the rigidity around the through
hole of the diaphragm 10.
[0045]
DESCRIPTION OF SYMBOLS 1 support member 1a opening part 2 speaker 3 rear cover body 3a
annular flexible member 3b inflexible diaphragm 4 gasket 5 spacer 6 frame 6a annular part 6b
notch hole 6c support part 7 magnetic circuit 7a center pole part 7b bottom plate 7c annular
magnet 7d annular top plate G magnetic gap SL1 gap sandwiched between voice coil 8 and
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center pole 7a SL2 gap sandwiched between voice coil 8 and annular top plate 7d 8 voice coil 9
bobbin 10 diaphragm 10a edge 11 cap 11a through hole 12 damper S air chamber S1 vehicle
interior space S2 vehicle exterior space S3 bobbin interior space S4 space between magnetic
circuit 7 located outside bobbin 9 and damper S5 S5 diaphragm 10 and damper 12 Space
between
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